Protective helmet



FIG. 1. is an upper perspective view of the helmet;

FIG. 2. is a lower perspective view thereof

FIG. 3. is a front view thereof;

FIG. 4. is a rear view thereof;

FIG. 5. is a right side view thereof;

FIG. 6. is a left view thereof;

FIG. 7. is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM I claim the ornamental design for a protective helmet, as shown and described. 